When you buy your toilet, you will choose between a spider handle and a foot spider handle. You may also have an older crank handle (no longer available). If you decide at a later date that you would like a different style from the one your composting toilet came with, you can buy the different style at a reasonable price and change it out in a minute or two.
The spider handle is great for narrow areas where clearance is an issue. The foot spider is a handy way to churn the compost without leaning over.